Research On Vibration Control For Steel Pedestrian Bridge Applied To TMD

With the trunk road widening, the main routes in the general is 40 ~ 50 m in width. For 40 ~ 50 m span of a single-span steel girder bridges, the first-order vibration frequency follow the normal pedestrian's frequency proximately, easy resonance, and impact the structural safety of normal use, in addition, vibration might exceed the limit of human comfort. pedestrians psychological can cause panic.TMD used to reduce the amount of vibration of the flyover would be a good solution, as well as practicable. After the installation of TMD, the vibration response will be greatly reduced to meet the requirements of comfort. TMD can easily install in both the building flyovers and builded pedestrian bridge. For vibration control of builded pedestrian bridge, TMD will have greater advantages. So it is great prospects for the application and popularization that TMD control the vibration of steel pedestrian bridge. Based on a 49-meter-steel pedestrian bridge example, the vibration control applied to TMD is studide, work and research as follows :1. In the many crowd load model , one choosed of the most appropriate is one that will reflect the pedestrian nature of the load model.2. According to the selected load model,calculate the vibration response of pedestrian bridge with TMD and compare the reponse of footbridge without TMD to determine the effect of vibration control for TMD.3. Dynamic characteristics that have changed is discussed after adding TMD into footbridge.There are two kinds classic TMD's parameter optimization method,one is international common Den Hartog parameter optimization method the other is model-1 a parameter optimization method deduced by Chinese scholars,and respectively compare the effect of the two kinds method,indetify the better parameter optimization method.4. Finally a pedestrian bridge's pedestrian comfort is evaluated.